greyfu

Greyfu Login Captcha adds a secure verification step to your WordPress login form, helping block automated login attempts and brute-force attacks.
Lite Version (Free): 
* Simple math-based captcha 
* Multisite compatible 
* Lightweight and fast 
* No personal data stored or transmitted 
* Works without any external service
Pro-Ready Features (Optional Upgrade): 
* Infrastructure prepared for reCAPTCHA v2 integration 
* Infrastructure prepared for hCaptcha integration 
* API key fields included
The free version is fully functional on its own and does not require any external captcha service.
<h3>Third Party Services</h3>
This plugin optionally connects to external captcha services when the Pro features are enabled:
Google reCAPTCHA (Optional) 
When reCAPTCHA is enabled in Pro settings, the plugin sends verification requests to Google’s reCAPTCHA service. 
– Service: https://www.google.com/recaptcha/ 
– Privacy Policy: https://policies.google.com/privacy 
– Terms of Service: https://policies.google.com/terms 
– Data sent: User’s IP address and reCAPTCHA response token 
– When: Only during login form submission when reCAPTCHA is enabled
hCaptcha (Optional) 
When hCaptcha is enabled in Pro settings, the plugin sends verification requests to hCaptcha service. 
– Service: https://www.hcaptcha.com/ 
– Privacy Policy: https://www.hcaptcha.com/privacy 
– Terms of Service: https://www.hcaptcha.com/terms 
– Data sent: User’s IP address and hCaptcha response token 
– When: Only during login form submission when hCaptcha is enabled
The free/lite version uses a built-in math captcha that does not connect to any external service.
<h3>Support / Contact</h3>
For issues or questions, please contact us: 
Email: hello@greyfu.com 
Website: https://greyfu.com

Greyfu Login Captcha

A lightweight captcha that protects your WordPress login page from automated bot attacks using a simple math challenge.

Faison

<a href="http://faisonz.com/" title="Faison Zutavern's Personal Blog" rel="nofollow ugc">Faison Zutavern</a>, <a href="https://profiles.wordpress.org/jvalcq" title="Jon's WordPress.org Profile" rel="nofollow ugc">Jon Valcq</a>, and <a href="https://profiles.wordpress.org/emmaee" title="Emma's WordPress.org profile" rel="nofollow ugc">Emma Edgar</a>, from <a href="http://www.orionweb.net/" title="Milwaukee Area Web Developers" rel="nofollow ugc">Orion Group LLC</a>, bring superior Brute Force Attack protection to WordPress with their new plugin, Project Force Field. By tracking failed login attempts and taking advantage of Apache’s mod_rewrite module, Project Force Field stops Brute Force Attacks from bogging down your sites and servers.
Special thanks to <a href="http://www.aykcreative.com/" title="Ayk Creative | Graphic Support for your Projects" rel="nofollow ugc">Chris Aykroid</a> for the plugin banner 😀
<h4>Contributing</h4>
If you would like to contribute or fork Project Force Field, we currently have a repo on Bitbucket. You can <a href="https://bitbucket.org/oriongroup/project-force-field/" rel="nofollow ugc">find it here</a>
<h4>Features!</h4>
<ul>
<li>Sends a 403 error code to anyone visiting /wp-login.php – All brute force attacks we’ve seen target /wp-login.php. By responding with a 403 error, your WordPress files aren’t loaded, the Database isn’t queried, and the attacker doesn’t figure out your password.</li>
<li>Changes the default login url – While a so-called hacker is being deflected by your new Force Field, you will log in with ease at /wp-admin/. When you do that, WordPress will redirect you to the new, proper login url.</li>
<li>Automatically changes the login when a Brute Force Attack is detected – When too many login failures occur within a minute, Project Force Field shifts polarity! The new login you previously used now responds with a 403 error, and a large random number is now used as your login url! After some time, the login will return back to normal.</li>
<li>Unlimited polarity shifts – If a Brute Force Attacker gets smart and writes a script to check for the new login url, Project Force Field will continue to detect the attack and change the login.</li>
<li>Define the login yourself – By defining <code>OGFF_LOGIN</code> in your wp-config.php, you can set the login to be almost anything you want.</li>
<li>Stops WordPress User Enumeration Exploit – Many brute force attacks use the WordPress User Enumeration exploit to easily figure out valid usernames. We stop that to protect your site, and respond with a 403 to save your server.</li>
</ul>
<h4>Future Features!</h4>
<ul>
<li>Multisite Support – It’s not there yet, that’s pretty lame, so I’m going to fix that before anything else!</li>
<li>Adjust the login failure threshold – Currently, Project Force Field assumes a brute force is underway when there have been 30 login failures within a minute. This might not be ideal for large websites, so we want to let you increase that amount to 300 if needed.</li>
<li>Add optional email notification for brute force events – If you want to know when your website is under attack, we want to let you know. In a near future version, we will let you add email addresses to be notified of brute force attacks, and any other important related events that we add in the future.</li>
<li>Add last resort .htaccess password lockdown – If a so-called hacker writes a script that continues to learn the new login url, Project Force Field won’t help much. In an upcoming version, we will check to see how many times the login url was changed, determine if the Brute Force Attack is smart, and lockdown the login with an .htaccess password.</li>
</ul>

Project Force Field

Save your WordPress sites and servers from certain death during brute force attacks with Project Force Field by Orion Group!

Greyfu Login Captcha vs Project Force Field